Try:
36 g of H2O = 1.998 mol
- Molar mass
- 18.015 g/mol
- Mass
- 36 g
- Amount
- 1.998 mol
- Molecules / formula units
- 1.203 × 10²⁴
- Total atoms
- 3.610 × 10²⁴
- Molar mass of H2O: 1 × 15.999 + 2 × 1.008 =
18.015 g/mol - moles = mass ÷ molar mass = 36 g ÷ 18.015 g/mol =
1.998 mol - particles = moles × NA =
1.203 × 10²⁴
How it works
The mole is chemistry's counting unit: one mole is 6.022 × 10²³ particles. The molar mass of a substance — the sum of the atomic weights in its formula, in g/mol — is the mass of one mole of it. That makes it the conversion factor between a mass you can weigh and a number of particles you can't count directly.
So grams ÷ molar mass gives moles, moles × molar mass gives grams, and moles × 6.022 × 10²³ gives particles. You can type large numbers in scientific notation as 6.022e23 or 6.022x10^23.
Frequently asked questions
- How do you convert grams to moles?
- Divide the mass in grams by the molar mass in grams per mole: moles = grams ÷ molar mass. For 36 g of water (18.015 g/mol), that is 36 ÷ 18.015 ≈ 2.00 mol.
- How do you convert moles to grams?
- Multiply the number of moles by the molar mass: grams = moles × molar mass. Half a mole of sodium chloride (58.44 g/mol) weighs 0.5 × 58.44 = 29.22 g.
- How many particles are in a mole?
- Exactly 6.022 140 76 × 10²³ — the Avogadro constant, which has been an exact defined value since the 2019 redefinition of the SI. Multiply moles by this number to get atoms, molecules or formula units.
- What is the difference between molecules and atoms here?
- One mole of water contains 6.022 × 10²³ molecules, but each molecule has three atoms, so it contains about 1.807 × 10²⁴ atoms. The converter shows both whenever the formula has more than one atom.
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